likely not, but phpbb-2 seems to work ok on my Symbian phone. Not great but it's at least usable.
Symbian is using a Webkit based browser.

Definitely not designed for touchscreen in mind, and not very likely f.g.o will convert to something else as even the phpbb3 switchover is kind of hard to do...._________________Intel Core i7 2700K@ 4.1GHz/HD3000 graphics/8GB DDR3/180GB SSDWhat am I supposed watching?

The biggest issue is screen size. The forum seems to insist on a specific screen width, and on my phone it means you scroll over a page or two every line, and then scroll back to read the next part.

I've noticed that html5 is fairly well implemented by Android, at least for the features which were desperately needed. If the layouts could be changed to generate html5 content and then add css for phones and tablets, then I would be happy with that.

Firefox on Android already allows double-click to zoom an article, but since site uses fixed widths it pretty much disallows text wrapping or any of the other things that make a smart phone able to read it.

I'm not master of webdesign, but AFAIK there's the possibility to force-wrap content using CSS, so you might do better with a custom stylesheet - provided you find a way to enable it on your phone.

Myself, I don't have a problem, at least in landscreen-mode, but then again I've got a 1280x720 display._________________++++++++++[>+++++++>++++++++++>+++>+<<<<-]>++.>+.+++++++..+++.>++.<<+++++++++++++++.>.+++.------.--------.>+.>.

As for your main concern, I'd second the request for a more modern forums software, problem is our forum devs/admins have pretty high standards and demands and since there's been no update to phpbb3 as of today, adapting can take quite a while. Tapatalk would also be acceptable, but yet again, that isn't compatible with the current forums software without jumping through a lot of hoops._________________++++++++++[>+++++++>++++++++++>+++>+<<<<-]>++.>+.+++++++..+++.>++.<<+++++++++++++++.>.+++.------.--------.>+.>.

Another app? If you mean that for Tapatalk, it's merely a kind of plug-in automatically providing mobilized versions of the forum's content.

The discussion to update the board to phpbb3 is going on for years, but AFAIK it's not done somewhere in the open(haven't found some kind of mailinglist on that topic), every now and then someone pops up asking when we're getting upgraded, someone jumps in and says 'when it's done', but so far IIRC no admin jumped in and presented an actual roadmap or an update if it's still on the to-do stack or we're "doomed" to use this version forever._________________++++++++++[>+++++++>++++++++++>+++>+<<<<-]>++.>+.+++++++..+++.>++.<<+++++++++++++++.>.+++.------.--------.>+.>.

OK well I guess the first thing is, I assume the admins have done some sort of changes to this one.

Do you know if the changes are in source control somewhere? Github or svn or something?

It's possible to retroactively apply your changes to svn, for example, and then upgrade the bbs and your changes come with it. Your website admins might not know about that but I guarantee your programmers do.

That might help ease the pain of an upgrade.

Another thing, you need to have a VM or another piece of hardware to test the upgrade on, and for the developer to work from.